Which Is Correct About the Contraction Sequence of the Heart

question 12

Multiple Choice

Which is correct about the contraction sequence of the heart?

• A)The contraction and relaxation of of all four chambers happen at the same time.
• B)The right atrium and ventricle contract at the same time,and as they are relaxing the left atrium and left ventricle begin to contract.
• C)Contraction begins in this order: right atrium then right ventricle then left atrium then left ventricle.
• D)The two atria contract at the same time,and as they are relaxing,the two ventricles contract together.
• E)The atria and ventricles begin their contractions at the exact same time,but the atrial contraction only lasts half as long as the ventricle contraction.

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